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IDLE: Handle bad highlight tab color config #85604
Description
| BPO | 41432 |
|---|---|
| Nosy | @terryjreedy |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-07-29.03:33:23.391>
labels = ['expert-IDLE', 'type-bug', '3.10']
title = 'IDLE: Handle bad highlight tab color config'
updated_at = <Date 2020-07-29.03:33:23.391>
user = 'https://github.com/terryjreedy'bugs.python.org fields:
activity = <Date 2020-07-29.03:33:23.391>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-07-29.03:33:23.391>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 41432
keywords = []
message_count = 1.0
messages = ['374558']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41432'
versions = ['Python 3.10']Linked PRs
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terryjreedy commented on Jul 29, 2020
https://stackoverflow.com/questions/35397377/python-freezes-when-configuring-idle froze IDLE with a custom theme missing 'colours for the blinker and highlighting'. I reported some experiments there. Tracebacks might help, but
Proposal 1: check theme before try to paint. All keys present? Replace missing with normal colors.
https://stackoverflow.com/questions/63137659/idle-crashing-when-i-press-configure-idle froze IDLE with a custom theme with a bad color "bpo-00224".
File "C:\Users\...\idlelib\configdialog.py", line 1279, in paint_theme_sample
self.highlight_sample.tag_config(element, **colors)
...
_tkinter.TclError: invalid color name "bpo-00224"
Proposal 2: wrap line in try-except, if error text matches, extract bad color, replace any occurrence of bad color with "bpo-000000" (black) or "#FFFFFF" (white), report to user with suggestion to edit. Maybe save first. Should do within loop in case more errors.
serhiy-storchaka commented on Sep 16, 2026
The missing-element part of this issue was already fixed: GetThemeDict() substitutes default colors and warns. The remaining part, an invalid color string, still crashed the Settings dialog. #157620 checks the user themes at IDLE startup, warns about invalid colors and uses the default colors instead.